Furnace.



L. L. KNOX. FURNACE. APPLIOATIOR IILED JUNE 30,1908.

9 1 9, 1 87, Patented Apr. 20, 1909.

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L. L.KNOX.

FURNACE.

APPLICATION FILED JUNE 30,1903- 919,187. Patented Apr. 20, 1909.

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FURNACE. 'APPLIOATION FILED JUNE 30,1908.

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L. L. KNOX.

FURNACE.

APPLICATION TILED JUNE 30,1908.

Patented Apr. 20; 1909.

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' UNITED STA OFFICE.

LUTHER L. xNox,'oF BEN AVON, PENNSYLVANIA, AssieNO TO KEYSTONE FURNACE CONSTRUCTION *OOMPA-NY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.

FURNACE Specification of Letters Patent.

Patented April 20, 1909.

To all whomc't may concern:

Be it known that I, LUTHER L. KNox, of Ben Avon, Allegheny county, Pennsylvania, have invented a new and useful Improvement in Furnaces, of which the following is a full, clear, and exact description, reference being had to the accom anying drawings, forming part of this s ec' 'cation, in which- Figure 1 is a side e evation of a portion of the charging side of an open hearth furnace embodying my invention, with the necks connecting the regenerators with the slag pockets in section; Fig. 2 is a longitudinal section of the same; Fig. 3 is a plan view; Fig. 4is a section on the line IVIV of Fig. 3.

My invention has relation to improvements in furnaces, and is applicable to various kinds of furnaces, such as open hearth furnaces, melting furnaces,'heating furnaces,

etc., and is designed to provide means of novel and effective character for protecting the walls of the furnace and other parts thereof, or such portions thereof as may be necessary, from the more or less rapid destruction which ordinarily takes place in furnaces of. this class.

My invention consists in the provision of novel means for water-cooling the various I portions of the furnace walls which are most subject to this destructive action, such as the side walls, end walls, the roof, ports, and the up-takes.

The precise nature of my invention will be best understood by reference to the 81006111: panying drawings, in which I have shown the invention as applied to an open hearth furnace, it being premised, however, that the details of construction and arrangement of the. coolin means may be variously changed by those s ed in the art without departing from the spirit and scope of my invention,

. and that the invention is equally applicable to other types of furnaces in the general class above stated.

In these drawings, thenumeral 2 designates the side walls of the furnace, the wall at.

the charging side being provided with the usual charging doors 3 and mending door4, and the opposite wall having the usual tap pe 6 designatesa ortion of the hearth of the furnace, 7 the'arc ed roof, 8 the gas u -take leading from the slag pocket 9, 10 t e gas port leading fromthe up-take 8 into the furmice, 11 one of the .air up-takes (shown in to t e end of the furnace.

vide the side walls 2 of the furnace each with a plurality of coolin boxes or castings 14, which extend vertica 1y of the furnace walls,

and which are placed side by side, said boxes extending upwardly from a point somewhat above the normal level of the bath in the furnace throu h and above the tops of the side walls. I hose boxes or castings which dotted lines in Figs. 1 and 2), and which' are immediately above the charging and I mending doors are ,of course necessarily shortened, and extend u wardly from a point shortly above these oors, as shown in ig. .1. To receive these boxes or castings the side walls of the furnace are provide with vertically extending pockets into which the boxes may be placed, and from which they can be readily removed. To facilitate the construction of these pockets, the boxes are preferably made of a rectangular crosssection whose area bears a definite relation to the sectional area of the bricks employed in the construction of the walls, so that the walls may be built to form these pockets without necessitating the cutting or breaking of the bricks. Suitable means are pro vided for the circulation of water throu h each of these boxes or castings, the co (1 water gbeing taken in at thelower ends by means of suitable pipe connections 15, and the heated water being taken out at the upper ends by means of connections 16. Any

suitable arrangement of circulating pipesm'ay be provided to which these connections lead.

The boxes 14 Ipreferably not only extend throughout the ength of the wide-wall-s of the hearth portion ofthe furnace, but are also provided in the side walls of the ports, as shown in Figs. 1 and 2.

Resting on each side of the walls 2 and sup o'rted by the skewback channels 17, is a ollow watercooled skewback 18, which extends the full length of the furnace, being built in sections as shown in Fi ientl extended at the sides of the ports and These skewbacks'support the roof arch 7, which is provided with a series of longitudinally extending-cooling boxes or castings 19, which also extend the full length of the furnace, being 1, so that it may be convenrounding water-cooled frame 28.

continued over the ports. These boxes 01' all ortions of the furnace which are ordicastings 19 'are'removably seated in pockets or recesses formed in the upper surface of theroof arch, and from which they are readily removable, being preferably made in sections of any convenient length.

The arch between the gas and air ports is formed in two sections 20 and 21, the outer section 20 over the gas up-take 8 being a solid brick arch, and the inner or nose portion 21 being removable and consisting of a hollow arched casting having skewbacks 22 which support the refractory roof 23 of the gas port, said casting also carrying the refractory covering 24 which forms the floor of the air port. This removable section 21 is seated between the solid brick arch 20 and a solid nose abutment 25. To provide for the removal of the section 21 the roof of the furnace over the air port is provided with an opening, 'which is preferably provided with a surrounding water-cooled frame or rim 26 and in which is seated a removable door 27 of refractory material and having a sur- The circulating connection s29 forthe hollow casting in the removable section 21 are carried downwardly through the door 27 and through a protecting pier 30 of refractory material. The hollow casting is preferably formed with a transversely extending conipartment 31, into which the inlet pipe loads,

and from which extend a series of pipes 32 into the interior of the casting, said pipes being arranged to discharge near the nose end of the casting, and the outlet'pipe 29 being connected to the highest point of the casting below the inlet, as shown in Fig. 2. l

33 designates transversely extending watercooled boxes, one of which protects the abutment wall 25, and both of which form a support for the casting of the removable section 21. These boxes or castings 33 extend transversely into the furnace from both sides, as shown in dotted lines in Fig. 4.

The-end wall of the furnace is provided with a series of verticallyextending removable boxes or castings 34, which are similar in their arrangement to theboxes or castings 14 in the side walls, but which preferably extend downwardly or to a point near the slag pockets, and which may be extended downwardly sufiieiently to also protect the walls of the. slag pocket. Tliesaboxes 34 effectively prevent the cutting away of the rear walls of the gas up-take, without, however, exerting a sufficient cooling action to lower the temperature of. the gas.

35 designates a cooling pipe, which extends transversely through the fioor of the gas port and crossing the furnace, to prevent the cutting away of such wall and to als protect the walls of the up-takes.

It will be seen that I provide by simple and effective means for the water-cooling of narl y most subject to the destructive action of the heat, this being effected for the most part by the arrangement of the vertically re- ,movable boxes or castings which can be readily seated in boxes rovided therefor in the brick-work, and eac 1 of which is readily removable, so that it may be removed and replaced when necessary. The several boxes or castings are provided with any suitable effectively cooled and protected by the arrangement of the cooling boxes as described.

It will be understood that the precise arrangement and form of the cooling box will necessarily depend in each case upon the size, character, &c., of the furnace, and will vary according to these circumstances; also that in some furnaces it may not be desired to rovide all the portions thereof which I have lierein shown and described with watercooling means as in some cases the cooling means for the slag pots I and regenerators can be omitted also that cooling means may be provided for only those arts where they are considered most desirable for any particular case.

What I claim is l 1. A regenerative reversing furnace, having its side wall formed with a plurality of open vertical pockets, arranged in parallel,

spaced relation, and water cooling boxes or castings removably seated in said pockets, substantially as described.

2. A regenerative reversing furnacehaving its sideand port walls formed with a plurality of open vertical pockets, arrangedin parallel, spaced relation, and water cooling boxes or castings removably seated in said pockets, substantially'as described.

3. A regenerative reversing furnace, having skewback channels at the upper portion ofits side walls, and a series of pockets extending downwardly into the side wallsbehind the skewbacks, and water cooling boxes or castings seated in said pockets and removable from the top of the furnace, substantially as described.

4. A regenerative reversing furnace, having vertical open pockets in its walls, and

cooling boxes removably seated in said ing a roof of refractory material and provi ed with a plurality of longitudinally extending cooling boxes or castings embedded in the roof and spaced from each other by the refractory material thereof, substantially as described.

6. A furnace having a roof provided with a series of longitudinally extending cooling boxes or castings seated in recesses in the upper side of the roof and removable therefrom, said boxes being formed in sections, and extending over the hearth and also over the ports; substantially as described.

' 7. A regenerative reversing furnace, having a roof of refractory material and provided with a plurality of longitudinally extending cooling boxes or castings embedded in the roof and spaced from each other by the refractory material thereof, said boxes being formed into separate sections placed end to end, substantially as described.

8. A regenerative reversing furnace, having a roof of refractory material provided with a plurality of spaced, longitudinally extending angular pockets, and a plurality of longitudinally extending cooling boxes or castings of angular form seating substantially flush within the said pockets, substantially as described.

9. A furnace having gas and air ports, a roof having an opening therein, and an arch separating the gas and air ports, said arch having a portion which is removable vertically through the opening in the roof of the furnace; substantially as described.

10. A furnace having gas and air ports, a roof having an opening therein, and a refractory arch between said ports, said arch having a nose portion vertically removable through the opening in the roof of the furnace; substantially as described.

11. A furnace having gas and air ports, a roof having an opening therein, and an arch between said ports, said arch having a nose portion removable through the opening in the roof of the furnace and provided with means for circulating a cooling fluid therein; substantially as described.

12. A furnace of the character described having an arch between its gas and airports provided with a removable nose portion, the roof of the furnace above such portion being provided with a removable watercooled portion or door; substantially as described.

13. A furnace having gas and air ports, up-takes leading thereto, and cooling boxes or castings removably seated in vertical pockets in the back wall of the tip-takes; substantially as described.

14. A furnace having gas and air ports and an arch between said ports, said arch having a removable nose portion, and cool- .ing boxes or castings extending below and supporting said removable portion; substantially as described.

'15. A furnace having gas and air ports and an arch between said ports formed with a vertically removable section, said section consisting of a body of refractory material having a water-cooled box or casting therein, said box or casting having an inlet compartment at one end and a plurality of pipes leading from said compartment and d s charging into the interior of the box or casting, together with circulating connections therefor; substantially as described.

1n testimony whereof, I have hereunto set my hand.

' LUTHER L. KNOX.

Witnesses:

H. M. CORWIN, GEO. H. PARMELEE. 

